Read the evidence
The first message describes typical temperature for the current month. Later messages reveal other geographic and environmental clues. Every message refers to the same city.
A GEOGRAPHY DEDUCTION GAME
CLUES FROM
ORBIT
Find the target city.
Stop the alien attack. Save Earth.
Decode alien messages and move your shields to protect the hidden city. Survive attacks as your shields disappear, then make your final city choice.
UNIDENTIFIED CRAFT / SIGNAL ACQUIRED
UPLINK ACTIVE
LIVE DEFENSE GRID
Protect the unknown.
No shields removed yet.
Select a shield, then click the map or drag it to protect an area.
THE WORLD IS YOUR PUZZLE
One hidden city. Six chances to narrow it down.
An alien transmission describes a city without naming it. Compare its climate, elevation and geographic surroundings, then place shields across the world map. Every successful defense brings a new clue and fewer shields: 10, 8, 6, 4, 2, then one final city choice.
Protect possibilities
Cover several plausible regions while the clues are broad. A successful defense confirms the city was protected, but decoy impacts conceal which shield saved it.
Make the final call
In round six, select the exact target from 205 cities. A victory or defeat reveals the city and a complete explanation of the clues.
A puzzle built from real geography
City locations, long-term climate and environmental measurements give each mission its evidence. These are stored reference datasets, not live weather. Use the field guide to understand what each clue measures, or read the dataset citations and limitations.
Play with a mouse, touchscreen or keyboard. There is no placement countdown, account requirement or purchase. Reloading starts a fresh session.
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